AS8506C
Battery Cell Monitor and Balancer IC
The AS8506C is a battery management IC dedicated to support
General Description
cell voltage measurement, monitoring, cell balancing and
temperature measurement functions in Li-Ion battery stacks for
industrial/consumer/PV battery applications.
Ambient temperature range is from -40C to +85C.
It features cell voltage diagnosis with externally adjustable
upper and lower cell voltage limits, fast cell voltage capture on
request through 12-bit SAR ADC, passive cell balancing by
simultaneous comparison of actual cell voltages with a
reference cell voltage and temperature measurement on two
external NTC sensors through 12-bit ADC.
Cells that are above reference will sequentially be discharged
through integrated switches and one external resistor.
There is also an active balancing option AS8506C A through
factory setting to sequentially charge cells which are below
reference from an external DC-DC Flyback converter and an
integrated low side driver.
The device can be used flexibly for battery stacks up to 7 cells
with a minimum stack voltage of 6V and a maximum stack
voltage of 32V.
It can be chained to support battery packs of virtually any
number of cells in synchronized mode through chained clock
and trigger signal.
The status of the battery stack is communicated to outside
world through ORd voltage_ok signal and balance ready signal.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet Page 1
[v1-02] 2014-Nov-06 Document FeedbackAS8 506 C Gen e ra l De s c rip t ion
Key Benefits & Features
The benefits and features of AS8506C, Battery Cell Monitor and
Balancer IC are listed below:
Figure 1:
Added Value of using AS8506C
Benefits Features
Reduce filter / synchronization effort. Acquired data
have same time stamp to inherently generate Simultaneous cell voltage capture for safe operating
accurate comparison results independent from load area (SOA) monitoring and balancing.
transients.
Strongly reduces data communication and data
Autonomous balancing and SOA monitoring.
processing and thereby improves EMC robustness.
To compensate accumulative charge differences
only. This mitigates cases of occasional wrong
Autonomous passive balancing in the 100 mA range
balance decisions due to flat OCV characteristic or
mismatch in cell temperature
Intrinsic inter module balancing through charge
redistribution, efficiency improvement in case of Option for active charge balancing with very few
leakage path due to defect induced leakage in external components.
particular cells.
For OCV capture, cell impedance calculation, Absolute cell voltage read out, read out of two
diagnosis temperature sensors.
40-pin MLF (6x6) package, very low number of external
Small form factor, low BOM
components.
Applications
The applications of AS8506C include:
The AS8506C is ideal for simultaneous cell monitoring and
cell balancing in stacked energy storage systems. Current
levels in the 100 mA range enables to compensate
accumulative SOC mismatch over the entire cell pack.
Typical applications are
- Li-Ion batteries up to 200 cells,
- Energy storage systems to buffer energy from PV
panels or for emergency power supplies,
- Battery management for e-scooters and e-bikes,
Page 2 ams Datasheet
Document Feedback [v1-02] 2014-Nov-06